Apparatus for drawing patterns from molds.



Patented oct. 23, |900. J. H. B. BRYAN.

(Application med Jan. 24, 1900.)

2 SheetsSheet l.

NT ff TH: Nimbus PETERS CDY PHOTO-nwo., WASHINGTON, n. c.

APPARATUS FORDRAWING PATTERNS FROM MOLDS.

(No Model.)

775551Z@ 5.5 es

Patented Oct. 23, |900.

J. H. B., BRYAN.

APPARATUS FOR DRAWING PATTERNS FROM MLDS.

(Application filed Jan. 24, 1900.)

2 Sheets-f-Sheet 2.

(N0 Model.)

UNITED STATES PATENT OFFICE.

JOHN H. B. BRYAN, OF BUFFALO, NEW YORK.

APPARATUS Fon DRAWING PATTERNSFROM Mon-DS.

SPECIFICATION :forming` part of Letters Patent No. 660289,.' dated October 23, 1900.

Application led 'January 24, 1900. serial No.2.648y (No-model.) 'I

To all whom t may concern: Be it knownthat I, JOHN H. B. BRYAN, a citizen of the United States, residing at Buffalo, in the county of Erieand State of Newv York, have inven t-ed new and useful Improvements in Apparatus for Drawing Patterns f scribed in my application for Letters Patent.

filed November 28,1899, Serial No. 738,549. The apparatus shown in this former application is more especially designed for lifting small patterns from molds and is mountedin a swinging support, which necessitates carrying the flasks containing the molds from which the patterns are to be lifted to and from the patternlifting apparatus. Vhen molding large or heavy patterns, the flasks containing the saine cannot lbe conveniently carried to and from the pattern-lifting apparatus.

One object of this invention is to provide a traveling pattern-lifting apparatus which can be shifted from one flask to another for lifting the patterns therefrom.`

Other objects of this invention are. to improve the pattern-lifting apparatusin various respects and to provide the same with means for lifting and reversing the flask when the pattern to be molded is attached to a followboard.

In the accompanying drawings, consisting of two sheets, Figure l is a front elevation, partly in section, of the traveling pattern-lifting apparatus, showing the position of the parts preparatory to reversing the moldingflask. Figs. 2 and 3 are fragmentary vertical sections,. on an enlarged scale, taken in lines 2 2 and 3 3, Fig. l, respectively. Fig. 4 is a side elevation, partlyin section, of the apparatus, showing the flask reversed. Fig. 5 is a fragmentary front elevation of the apparatus, showing the flask, follow-board, and p`at` tern reversed and the follow-board and pattern lifted from the flask and mold. Fig." 6 is a fragmentary horizontal section,`on an'enlarged scale, of the air cock orvalvewhich controls the pneumatic flask-lifting devices, l

the sectionl being taken in line 6'6, Fig. 1.

Like'letters of reference refer to like parts in theseveral figures.

A'A represent two longitudinal main rails, which are supported overhead in 'the moldingroom inv any suitable manner, and B represents a wheeled bridge which is mounted on these rails. This bridge consists, essentially, o f two horizontal end frames b b, arranged adjacent to the rails A, two transverse rails b' b, connecting these end frames, and flanged supporting-wheels b2 b2, attached to each end frame and running on the adjacent longitudinal rail A. The bridge is preferably provided with guard-hooks b3, which project underneath the rails, as shown in Figs. 1 and 4,

and prevent the bridge from leaving the track.

vC represents a transversely-movable carriage which is mounted on the transverse rails b of the movable bridge. This carriage consists,'essentially, of a frame c, arrangedv above and between the transverse rails b' of the bridge, two pairs of flanged supporting- Aw-heels c c', journaled on opposite sides of the upper part of the frame c, each pair running on one of the transverse rails b of the bridge, a post or stein C', depending from the frame cfand having near its lower end arms O2, which project from the post transversely to the rails b of the bridge, and two flanged guide-wheels c2 c2, journaled on the arms O2'. Each guide-wheel engages against the under side of one of the transverse rails b', between the two supporting-wheels running on the top of the same, thereby forming a triangular bearing of the carriage on each rail b. These guide-wheels prevent the carriage from being lifted from the bridge. By arranging each of thuese guide-wheels between its companion supporting-wheels the wheels on the same side of the carriage bear against their rail at three points, whereby the carriage is prevented from rocking on the transverse rail b Ain a rdirection transversely to the main track.

The :dan ges of the wheels on the carriage hold the latter against lateralv displacement with reference to the transverse track.

The pattern-liftingapparatusis attached to the carriage O and is constructed as follows:

D represents a vertical lifting cylinder which is secured with its upper end to the lower end of the post C of the carriage-frame and which is provided at its lower end with a guide-head d.

E is a piston arranged in the cylinder and provided with a depending lifting or piston rod e, which is guided in the lower head dof the cylinder. This lifting 4or piston rod can be raised by exhausting the air from the cylinder above the piston and can be lowered by gravity upon allowing the air to enter above the piston. This pneumatic means is employed for raising the rod either for lifting the fiask or for drawing the pattern from the mold, but it is undesirable for lowering the rod, as the admission of air to the exhausted space above the pistou produces a jerky downward movement of the piston and rod. In order to enable the piston and rod to be lowered quickly and with a steady movement, the piston-rod is provided with a manual operating mechanism which is constructed as follows:

frepresents agear-pinion secured to a short horizontal shaft f', which is journaled transversely in bearings in the guide-head d.

jg is a vertical gear-rack meshing with the pinion and secured to the lifting-rod.

f3 is a hand-wheel which is secured to the` pinion-shaft and whereby the same is turned. Upon turning the hand-wheel in the direction of the arrow, Fig. 2, the lifting-rnd is raised by the pinion, while upon reversing the movement of the hand-wheel this rod is lowered. The lifting-rod may be held against downward movement by a detect-pawl g, which is pivoted on the guide-head d and which can be engaged with the pinion when the rod has been elevated and it is desired to hold the rod in its elevated position.

H represents a cross-head secured to the lower end of the lifting-rod and provided at opposite ends with flask-reversing rollers h.

I represents a molding-iiask provided on opposite sides with the usual trunnions t, whereby the ask is reversed.

J is the follow-board, which carries the pattern j and which is connected with the flask by pins t', arranged on the flask and entering perforations in the follow-board in a wellknown manner. The follow-board may also be attached to the ask, it' necessary, by any other well-known means.

K K represent loops or endless cords or belts which are hung with their upper bights or portions upon the reversing-rollers h and which are adapted to be engaged with their lower bights or portion's around the tru unions of the flask.

rlhe pneumatic means for operating the lifting-rod is constructed as follows: The upper end of the cylinder D is connected with an air-eXhausting mechanism. For this purpose a three-way cock M is provided, Figs. l, 4, and 6, having an inner branch or nipple m,

which connects with the upper end of the cylinder, an intermediate branch or nipple m', connected by a flexible branch tube m2 with a main flexible tube m3, leading to the air'exhaust device, and an outer branch or nipple m4, which opens into the atmosphere. The rotary plug m5 of this cock is provided with a depending acluating-rod m6, which is arranged with its lower end in convenient reach ol the operator. The lower end of this valve-rod rmis journaled in a bearing 'm7 on the lower head d of the cylinder and is provided with a handle m8 for convenient manipulation. Upon turning` the plug ofthe cock M so as to connect the interior of the cylinder with the exhaust-tube the air is eX- hausted from the cylinder and the piston and the parts connected therewith are raised. Upon turning` the plug of the cock M so as to connect the :interior of the cylinder with the atmosphere, as shown in Figk (i, the vacuum in the cylinder is broken and the piston and the parts connected therewith are permitted to descend by gravity. The lower head d of the cylinder is preferably provided with an air-passage rl', which permits of the ingress and egress of the air below the piston with suiiicient freedom toenable the pistonto move freely up and down.

For the purpose of permitting the bridge to be moved back and forth on the longitudinal track without disarranging the main exhaust-tube m3 the latter is looped at intervals and the loops are supported by hangers or trolleys N, which run on a rail or track n, arranged lengthwise below one of the main longitudinall rails As the bridge moves forward this tube is gathered and its loops descend and as the bridge moves backward the tube is extended and its loops rise.

0 represents a pneumatic suction cup or holder which is attached to the lower end of the liftingrod e and which is adapted to be placed upon a pattern or upon afollow-board carrying a pattern. This holder is attached to the pattern or follow-board by exhausting the air from the holder, so that upon raising the holder the pattern or board rises with the same. This holder is provided on its inner side with an elastic bearing rim or flange o',

Fig. 3, and is provided at its top with a short pipe o2, which is connected to the lower end of the lifting-rod.

P represents a three-way cock having an inner branch or nipple p, which connects with the upperend of the pipe 02, an intermediate branch or nipple p', which is connected by a branch pipe or tube 192 with the main exhausttube m3, and an outer branch or nipple p3, whichopensintotheatmosphere. Upon turning the plug p4 of this cock so that the interior of the holder is connected with the exhaust-tube, as shown in Fig. 3, the holder will attach itself to the,surface ot' the pattern or board upon which it is placed, and upon turning the plug of the valve, so as to place the interior of the holder in communication with the atmosphere, the vacuum is broken and the holder is released.

In the molding operation the follow-board, with the pattern secu redto its upper surface, is placed upon rails, bars, or some other firm and level bed L, which is arranged below the main rails and within reach of the traveling apparatus. The flask is then placed on the follow-board, and the molding-sand is packed into the flask over the pat-'tern and followboard. When the pattern is to be drawn, the bridge is moved on its track and the carriage on the transverse rails of the bridge as may be necessary to bring the carriage, with its liftingapp'aratus, over the flask. The liftingrod and connecting parts are now released by disengaging the pawl g from the pinion, and the latter is turned by the hand-wheel, so as to lower the lifting-rod sufficiently to vbring the lower parts of the reversing-cords K n ear the flask. These cords are now engaged with the trunnions t', as shown in Fig. l, and upon raising the lifting-rod the flask is raised by the cords from the bed L. The operator now turns or reverses the flask, follow-board, and pattern, so that the'follow-board is on top of the flask. During this turningmovement of the flask its trunnions roll on the lower bight of the cords or loops and the upper bights move around the rollers of the cross-head. When the flask has been reversed, itis again lowered upon the bed L andthe loops are detached from the trunnions preparatory to lifting the follow-board and pattern from the flask. After the flask has been so reversed, as shown in Fig. 4, and the reversing-cords have been detached from the flask the pneumatic holder is lowered upon the follow-board and the plug of the valve P is turned so that the air is exhausted from the holder, whereby the latter is firmly attached to the follow-board. 'lhe lifting-rod is nowraised by the exhaust device, whereby the follow-board is lifted from the flask and the pattern attached to the .follow-board is lifted out of the sand mold in the flask, as represented in Fig. 5. When the follow-board, with the pattern, has been removed from the flask, the board is detached from the holder by turning the plug P, so as to break the vacuum in the holder.

The lower part of the branch pipe pzis preferably rigid and guided during its up-anddown movement withthe lifting-rod in an eye p5, secured to the lower head of the cylinder.

When the pattern is not placed upon a follow-board, but is exposed in the upper part of the flask, the pneumatic holder is applied directly to the pattern. v

The bridge and carriage are readily moved to bring the lifting apparatus over any flask which is arranged in the molding-room within the area covered by the track on which the bridge travels, thereby making the lifting apparatus available for use in drawing the patterns from flasks located in differentparts o the molding-room. I claim as my invention- 1. In an yapparatus fordrawing patterns from molds, the combination -with a bridge movably mounted on a longitudinal overhead track, o f a carriage which is transversely movable on said bridge, a vertically-movable lifting device secured to said carriage and depending therefrom, and a suction-holder arranged at the lower end of said lifting device and adapted to be attached to a pattern, substantially as set forth.

2. In an apparatus for drawing patterns from molds, the combination with a horizontally-movable carriage, of ,a vertically-movable suction-holder mountedA on said carriage,

an exhaust-tube connected with said holder, v

and movable hangers which support said tube at intervals, substantially as set forth.

3. In an apparatus for drawing patterns f 4. In an apparatus for drawing patternsk from molds, the combination with a vertical cylinder, a piston arranged in the cylinder,.

and a suction-holder connected with said piston by a lifting-rod, of a main exhaust-tubey having branches which connect with said cylinder and said holder, and controlling-valves arranged in said branches, substantially as set forth.

5. In an apparatus for drawing patternsv from molds, the-combination with a liftingrod provided with a suction-holder, of a pneumatic means and a manual meansfor operating said rod, whereby the rod can be raised by the pneumatic means for drawing the pattern and can be lowered by manual means, substantially as set forth.

6. In an apparatus for drawing patterns from molds, the combination with a support having a vertical rectilinear guide, of a lifting-rod provided at its lower end with a suction-holder, a vertical gear-rack attached to said rod and arranged to move vertically in said guide, and a gear-pinion mounted in said support and meshing with said rack, substantially as set forth.

7. ln an apparatus for drawing patterns from molds, the combination with acylinder, a lifting piston and rod arranged therein, a

suction-holder attached to said rodand anV exhaust-tu be connected with said cylinder, of a gear-rack arranged on said rod, and a gearpinion meshing with said rack, substantially as set forth.

8. The combination with a lifting-rod, of a suction-holder attached to said rod and adapted to be attached to a pattern, rollers supported upon said rod, and loops hung upon roov to be engaged With the trunnions of a xnoldro ing-Hash, substantially as set forth. l

Witness my hand this 8th day of January,

said rollers and adapted to be engaged with the trunnions of a molding-flask, substantally as set forth.

9. The combination with a lifting-rod, of e. 1900. 5 suction-holder arranged on the lower end of said rod and adaptedto be attached to a pat- JOHN H' B' BRYAN' tern, a cross-head connected with said rod, rollers arranged 0n opposite ends of said head, and loops hung upon said rollers and adapted Witnesses:

M. L. CRAMER, T. J. HASSETT. 

